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the sum of n terms of an A.P. is 3n 2 +5. the number of term which equals 159 is???? the sum of n terms of an A.P. is 3n2 +5. the number of term which equals 159 is????
Tn=Sn-(Sn-1)Tn=159Sn=3n^2+5Sn-1=3(n-1)^2+5substitute these values and you get 27
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